Foreign Currency Derivatives - Effect of Derivative Instruments Designated as Cash Flow Hedges in Condensed Consolidated Statements of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Derivative Instruments Gain Loss [Line Items]
Foreign exchange contracts, Gain or (loss) recognized in OCI-effective portion, total	$ 6,298		$ (421)
Gain or (loss) reclassified from OCI into income- effective portion, total	2,558		(666)
Gain or (Loss) Recognized-Ineffective Portion and Amount Excluded from Effectiveness Testing	(31)	[1]	75	[1]
Product revenues
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total	6,636		(2,865)
Cost of revenues
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total	(801)		532
Sales and marketing
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total	(1,787)		1,080
Research and development
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total	(715)		415
General and administrative
Derivative Instruments Gain Loss [Line Items]
Gain or (loss) reclassified from OCI into income- effective portion, total	(775)		172
Interest and other income (expense), net
Derivative Instruments Gain Loss [Line Items]
Gain or (Loss) Recognized-Ineffective Portion and Amount Excluded from Effectiveness Testing	(31)	[1]	75	[1]
Foreign exchange contract
Derivative Instruments Gain Loss [Line Items]
Foreign exchange contracts, Gain or (loss) recognized in OCI-effective portion, total	$ 6,298		$ (421)

[1] There were no gains or losses recognized in income due to ineffectiveness in the periods presented.